Files with the extension EML are plain text files which additionally contain the header information and / or attachments and hyperlinks of emails. They are formatted in a proprietary format by Microsoft. This standard is used by eg Microsoft Outlook and many other email programs.
The files contain emails that have been saved for forwarding or backup. The formatting is similar to mht, the storage format for Microsoft Internet Explorer web pages. Therefore, Internet Explorer can display EML files.
Thanks to emlBridge almost any email program can import EML files.
Some malware generates EML files, so it's a good idea to check EML files attached to an email with an antivirus program.
Since the text of the email is stored as simple text, an EML file can also be opened and read with a text editor.